Major flaws with the Kaiju

Rating: 6/10 (17 July 2013)

Perhaps my feeble understanding of genetics and basic biology are at fault here, but I cannot overlook the contradictory logic behind the Kaiju. Shortly into the movie, thanks to Dr. Newton Geiszler (the Kaiju expert/groupie who had a "neuro handshake" with one of the monsters) discovers that all Kaiju have the exact same DNA; that the Kaiju are in fact all clones of each other, being created by other alien beings.
If the Kaiju were clones with matching DNA, they would look exactly alike; however, no two Kaiju in the movie look alike. Secondly, if the Kaiju are essentially lab-created clones, a Kaiju pregnancy would not arise; however, this occurs in the movie as well.
My last point: the Kaiju are amphibious ocean-dwellers, adapted with bioluminescence and crustaceous shells...so why would there be an overtly gorilla-esque Kaiju? If the Kaiju are so great at "evolving," (which also contradicts the clone theory) how and why would there be an obese gorilla-crab? Even with my limited knowledge of biology and zoology, I know gorillas are not renowned for their swimming ability (and by that, I mean they don't swim...at all).